<template>
    <el-container class="home-container">
        <!--头部区-->
        <el-header>
            <div>
                <img src="../assets/电商.png">
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <!--页面主体区-->
        <el-container>
            <!--侧边栏-->
            <el-aside :width="iscollapse ? '64px' : '200px'">
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <!--侧边栏菜单区 -->
                <!--  加上冒号绑定，true表示布尔值，不加表示字符串-->
                <!-- 激活菜单项default_active属性-->
                <el-menu background-color="#545c64" text-color="#fff" active-text-color="#409EFF"
                         :unique-opened="true" :collapse="iscollapse" :collapse-transition="false" :router="true"
                         :default-active="activePath">
                    <!-- 一级菜单 -->
                      <!-- index要求为字符串，而item.id为数值-->
                    <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
                        <!-- 一级菜单模板区域 -->·
                        <template slot="title">
                            <!--图标-->
                            <i :class="iconObj[item.id]"></i>
                            <!--文本-->
                            <span>{{item.authName}}</span>
                        </template>
                        <!--二级菜单-->
                            <!-- http://localhost:8080/#/110  改为  http://localhost:8080/#/users-->
                            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children"
                               :key="subItem.id" @click="saveNavState('/' + subItem.path)">
                                <!-- 二级菜单模板区域 -->
                                <template slot="title">
                                    <!--图标-->
                                    <i class="el-icon-menu"></i>
                                    <!--文本-->
                                    <span>{{subItem.authName}}</span>
                                </template>
                            </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            <!--右侧内主体-->
            <el-main>
                <!--路由占位符-->
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
export default {
  data () {
    return {
      // 左侧菜单数据
      menuList: [],
      // 一级菜单图标
      iconObj: {
        125: 'iconfont icon-gerenzhongxin',
        103: 'iconfont icon-qiye',
        101: 'iconfont icon-zhanghuguanli',
        102: 'iconfont icon-tongzhi',
        145: 'iconfont icon-tuxing'
      },
      // 菜单是否折腾
      iscollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
      // console.log(res)
    },
    // 点击按钮，切换菜单的折叠和展开
    toggleCollapse () {
      this.iscollapse = !this.iscollapse
    },
    // 保存链接的激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      // 再重新赋下值
      this.activePath = activePath
    }
  }

}
</script>

<style lang="less" scoped>
.home-container{
  height: 100%;
}
.el-header{
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  /*左右贴边对齐*/
  padding-left: 0;
  align-items: center;
  color: #ffffff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside{
  background-color: #333744;
  .el-menu{
    border-right:none;
  }
}
.el-main{
  background-color: #eaedf1;
}
.iconfont{
  margin-right: 10px;
}
.toggle-button{
  background-color: #4A5064;
  font-size: 10px;
  line-height: 24px;
  color: #ffffff;
  text-align: center;
  /*文本间距*/
  letter-spacing: 0.2em;
  /*鼠标放上出现小手*/
  cursor: pointer;
}
</style>
